http://openjdk.java.net/projects/code-tools/jmh/jmh-core/: The jmh is a Java harness for building, running, and analysing nano/micro/macro benchmarks written in Java and other languages targeting the JVM. (Oracle)
  • Aleksey Shipilev (Oracle/Sun, Red Hat)
  • Sergey Kuksenko (Oracle/Sun)
  • Anders Astrand (Oracle/BEA)
  • Staffan Friberg (Oracle/BEA)
  • Henrik Loef (Oracle/BEA) 
/*
 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package org.openjdk.jmh.annotations;

import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


OperationsPerInvocation annotations allows to communicate the benchmark does more than
one operation, and let JMH to adjust the scores appropriately.


For example, a benchmark which uses the internal loop to have multiple operations, may
want to measure the performance of a single operation:


@Benchmark
@OperationsPerInvocation(10)
public void test() {
     for (int i = 0; i < 10; i++) {
         // do something
     }
}



This annotation may be put at Benchmark method to have effect on that method only, or at the enclosing class instance to have the effect over all Benchmark methods in the class.


/**
 * <p>OperationsPerInvocation annotations allows to communicate the benchmark does more than
 * one operation, and let JMH to adjust the scores appropriately.</p>
 *
 * <p>For example, a benchmark which uses the internal loop to have multiple operations, may
 * want to measure the performance of a single operation:</p>
 *
 * <blockquote><pre>
 * &#64;Benchmark
 * &#64;OperationsPerInvocation(10)
 * public void test() {
 *      for (int i = 0; i &lt; 10; i++) {
 *          // do something
 *      }
 * }
 * </pre></blockquote>
 *
 * <p>This annotation may be put at {@link Benchmark} method to have effect on that method
 * only, or at the enclosing class instance to have the effect over all {@link Benchmark}
 * methods in the class.</p>
 */
@Inherited
@Target({ElementType.METHOD,ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface OperationsPerInvocation {

    
Returns:Number of operations per single Benchmark call.
/**
     * @return Number of operations per single {@link Benchmark} call.
     */
    int value() default 1;

}